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DETERMINING SHORT TO GROUND LOCATION (MS-CAN)

CAUTION:

System Wiring Diagram

Determination Procedure

CAUTION:

  • When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

  • When inspecting the DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.

Step

Inspection

Action

1

 INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-40 AND INSTRUMENT CLUSTER

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the connector C-40.

  • Inspect for continuity at the following terminals:

    • Between instrument cluster terminal C and body ground

    • Between instrument cluster terminal E and body ground

  • Is there continuity?

Yes

Go to the next step.

No

Go to Step 3.

2

 INSPECT CAN LINE IN INSTRUMENT CLUSTER FOR SHORT TO GROUND

  • Disconnect the instrument cluster connector.

  • Inspect for continuity at the following terminals:

    • Between instrument cluster terminal C (wiring harness side) and body ground

    • Between instrument cluster terminal E (wiring harness side) and body ground

  • Is there continuity?

Yes

Repair or replace the wiring harness between the instrument cluster and connector C-40 because the wiring harness is shorted to ground.

No

Replace the instrument cluster because there is a short to ground in the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

3

 INSPECT FOR SHORT TO GROUND BETWEEN CONNECTORS C-40 AND DLC-2

  • Inspect for continuity at the following terminals:

    • Between DLC-2 terminal L and body ground

    • Between DLC-2 terminal K and body ground

  • Is there continuity?

Yes

Repair or replace the wiring harness between connector C-40 and DLC-2 because the wiring harness is shorted to ground.

No

Go to the next step.

4

 INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-40 AND CONNECTOR C-14

  • Connect the connector C-40.

  • Disconnect the connector C-14.

  • Inspect for continuity at the following terminals:

    • Between DLC-2 terminal L and body ground

    • Between DLC-2 terminal K and body ground

  • Is there continuity?

Yes

Repair or replace the wiring harness between connector C-40 and connector C-14 because the wiring harness is shorted to ground.

No

Go to the next step.

5

 INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-14 AND CLIMATE CONTROL UNIT

  • Inspect for continuity at the following terminals:

    • Between climate control unit terminal D and body ground

    • Between climate control unit terminal B and body ground

  • Is there continuity?

Yes

Go to Step 8.

No

Go to the next step.

6

 INSPECT FOR SHORT TO GROUND BETWEEN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) AND CONNECTOR C-26

  • Disconnect the connector C-26.

  • Inspect for continuity at the following terminals:

    • Between blind spot monitoring (BSM) control module (LH) terminal D and body ground

    • Between blind spot monitoring (BSM) control module (LH) terminal E and body ground

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness between connector C-14 and connector C-26 because the wiring harness is shorted to ground.

7

 INSPECT CAN LINE IN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) FOR SHORT TO GROUND

  • Disconnect the blind spot monitoring (BSM) control module (LH) connector.

  • Inspect for continuity at the following terminals:

    • Between blind spot monitoring (BSM) control module (LH) terminal D (wiring harness side) and body ground

    • Between blind spot monitoring (BSM) control module (LH) terminal E (wiring harness side) and body ground

  • Is there continuity?

Yes

Repair or replace the wiring harness between the blind spot monitoring (BSM) control module (LH) and connector C-26 because the wiring harness is shorted to ground.

No

Replace the blind spot monitoring (BSM) control module (LH) because there is a short to ground in the blind spot monitoring (BSM) control module (LH).

(See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)

8

 INSPECT CAN LINE IN CLIMATE CONTROL UNIT FOR SHORT TO GROUND

  • Disconnect the climate control unit connector.

  • Inspect for continuity at the following terminals:

    • Between climate control unit terminal D (wiring harness side) and body ground

    • Between climate control unit terminal B (wiring harness side) and body ground

  • Is there continuity?

Yes

Repair or replace the wiring harness between the climate control unit and connector C-14 because the wiring harness is shorted to ground.

No

Replace the climate control unit because there is a short to ground in the climate control unit.

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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